Malicious PDF — malware analysis report

Static analysis result for SHA-256 13972452d72a9fba…

MALICIOUS

PDF

81.8 KB Created: 2021-04-01 19:39:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 117a900645c5c901726ff75b70f5a22b SHA-1: f3f5f2b4fe55108d975c035b3ad2968ee8018945 SHA-256: 13972452d72a9fba1bf0c352b21fa9f8e4abb2bc2fe50844e0996e0457a2f22e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-optimized and point to benign-looking documents, suggesting a link farm designed to obscure malicious activity. One of the primary external URIs, 'https://dugedepap.ru/123?utm_term=taking+berberine+and+metformin', is suspicious and likely leads to a phishing or malware distribution site. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/123?utm_term=taking+berberine+and+metformin PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459654/normal_5fde7f96dd60f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_602583ba7f3dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_5fd646c9c7cc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383695/normal_5ff3b33128265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386094/normal_5ffd3c4692704.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/nordictrack_c800_treadmill_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/what_are_barriers_to_effective_communication.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/64825222948.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/fezinubakavig.pdfIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_94511b51d5c2447db15df9b4c8ba095d.pdf?index=trueIn PDF document text
    • https://366cd995-4ddf-4220-a197-7cea849caf0e.filesusr.com/ugd/947062_2058f55bf5bd4cb981ecd24914f346b7.pdf?index=trueIn PDF document text
    • https://de26864d-dd79-4a6d-8467-b5cf435a6969.filesusr.com/ugd/6ff07c_5821ea1999d74a83819ed65c2a6d2c49.pdf?index=trueIn PDF document text
    • https://7031c68c-cf47-488c-b9bd-b344696616f5.filesusr.com/ugd/51e9e9_20a40e71ced241babd6665fe52bee5cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86dc1abe-4ef2-4f7f-a733-e4ad23ee55b0/55791129241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e7cdfb4-4248-49b4-b06a-bee7e68dd549/how_to_hard_reset_a_moto_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/898be58e-48fb-44e4-b305-914f3d671b8a/90998665852.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/jigikijufeviliw.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_6a5501a044d34b819490f9989ef6224c.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_aa12454a5262425fbb5249ce6edfd661.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/simujix/jetup.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 5172 bytes
SHA-256: 99499c5494c35ac02faba2ee95102c00597a92736e2555c16a7bafa00823d196
font_01_sfnt_off000113f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F6 11084 bytes
SHA-256: a7e2d50405e80930b27ba7d5aff7a46d58fdfc7b3404db4988a873ea0cfac86f

Open this report in the interactive analyzer, or submit your own file for analysis.